nanog mailing list archives
Re: Consequences of BGP Peering with Private Addresses
From: Jeff Wheeler <jsw () inconcepts biz>
Date: Thu, 16 Jun 2011 07:09:04 -0400
On Wed, Jun 15, 2011 at 12:47 PM, James Grace <james () cs fiu edu> wrote:
So we're running out of peering space in our /24 and we were considering using private /30's for new peerings. Are there any horrific consequences to picking up this practice?
I agree with other posters that this is not a good practice. Is it somehow not possible for you to obtain additional address space? Can you not use neighbor-assigned /30s more frequently to avoid exhausting your existing allocation? For eBGP neighbors, I would sooner use non-unique /30s than utilize RFC1918 space. While this would not allow for correct reverse DNS, and traceroute would be less obvious, it has fewer disadvantages than assigning RFC1918 for your peer link-nets. You will need to re-write next-hop towards iBGP neighbors, though (using next-hop-self or translating to internal numbers for routing protocol use) and you should not re-use the same /30 twice on the same ASBR. This may sound crazy, and it is certainly not an ideal way of doing things; but it is an alternative worth consideration as networks exhaust their available IPv4. -- Jeff S Wheeler <jsw () inconcepts biz> Sr Network Operator / Innovative Network Concepts
Current thread:
- Consequences of BGP Peering with Private Addresses James Grace (Jun 15)
- Re: Consequences of BGP Peering with Private Addresses Patrick W. Gilmore (Jun 15)
- Re: Consequences of BGP Peering with Private Addresses isabel dias (Jun 15)
- Re: Consequences of BGP Peering with Private Addresses Nick Hilliard (Jun 15)
- Re: Consequences of BGP Peering with Private Addresses Cameron Byrne (Jun 15)
- Re: Consequences of BGP Peering with Private Addresses isabel dias (Jun 15)
- Re: Consequences of BGP Peering with Private Addresses Jeff Wheeler (Jun 16)
- RE: Consequences of BGP Peering with Private Addresses Leigh Porter (Jun 16)
- RE: Consequences of BGP Peering with Private Addresses Tom Hill (Jun 16)
- RE: Consequences of BGP Peering with Private Addresses Leigh Porter (Jun 16)
- RE: Consequences of BGP Peering with Private Addresses Leigh Porter (Jun 16)
- Re: Consequences of BGP Peering with Private Addresses Adam Rothschild (Jun 16)
- Re: Consequences of BGP Peering with Private Addresses Patrick W. Gilmore (Jun 15)
- Re: Consequences of BGP Peering with Private Addresses Gaurab Raj Upadhaya (Jun 16)
- Re: Consequences of BGP Peering with Private Addresses Dobbins, Roland (Jun 21)